题目描述

Ugly numbers are numbers whose only prime factors are 2, 3 or 5. The sequence 
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, ... 
shows the first 10 ugly numbers. By convention, 1 is included. 
Given the integer n,write a program to find and print the n'th ugly number

输入要求

Each line of the input contains a postisive integer n (n <= 1500).Input is terminated by a line with n=0.

输出要求

For each line, output the n’th ugly number .:Don’t deal with the line with n=0.

输入样例

1
2
9
0

输出样例

1
2
10

提示

来源

New Zealand 1990 Division I,UVA 136